Friction-clutch.



No. 722,800. PATENTED MAB.. 17, 1903.

A. 'BOLZANI. FRIGTION CLUTCH. ArPLIogTIoN IILnp 'JUNE 2a. 1902.

N0 MODEL.

UNITED STATES PATENT OFFICE,

ANTON BOLZANI, OF BERLIN, GERMANY.

FRlCTlON-CLUTCH.

SPECIFICATION forming part 0f Letters Patent No. 722,800, dated March1'7, 1903.

Application filed June 23,1902.

To all whom, t may concern: Be it known that I, ANTON BOLZANI, a citizenof the German Empire, residing at Colony Grunewald, Berlin, in theKingdom ofvlrus-` sia, Germany, have invented certain new and usefulImprovements in or Relating to Friction-Clutches Particular-ly Adaptedfor Hoisting and Like Apparatus; and I do hereby de` In friction brakesor clutches for lifts andv hoists as hitherto used the driving part ofthe apparatus (hand-wheel, crank, pinion, motor, dto.) is generallyinluenced by the return or dropping of the load. If a brake is notcapable of stopping the load, the latter moves downward or drops if thedriving mechanism or the driving-motor is actually influenced by itsmotion, and therefore is not able to oer a sufficient resistance to thereturn or falling motion of the load.

In the present construction upon the'selection of proper proportions theload and the driving mechanism are separately controlled by equal brakedevices without a connectionv of both parts, which in a compulsorymanner causes the rotation. ing device is not desired, the load cannot,if

the present construction is properly carried out, automatically movedownward, so that the present construction must be considered as aconsiderable progress. A,

In the drawings, Figure lis a cross-section through the ratchet-wheelofthe brake mechanism, taken on the line 5c Qc' injFig. 2. Fig.

2 is a section through the brake mechan-ism,`

rigidly connected to a driving device a2, is-

mounted on the shaft a to be driven. The driving-wheel m is secured tothe eccentric b in any approved manner. In the construction shown thecollar b/ has a slot b2 in one If a motion of the driv-v Serial No.112,901. (No model.)

side of it, as shown in Fig. l, and lthe hub of the wheel oc has aprojection which enters this slot and which operates as a key to securethe ywheel rigidly to the eccentric. Around this eccentric is a ring c,which engages, by means of a pin d, with a corresponding hole in aratchet-wheel e, whereby it is coupled to the latter. The cylindricalhollow or flanged ratchet-wheel e is loosely mounted, with its hubconcentric to the shaft ot, upon a concentric collar b of the eccentricZJ. Loosely fitted on the ring c is an eccentric ring f, which fills upthe hollow space remaining between ring c and the inner circumference ofthe ratchet-wheel e after arranging about the shaft et the eccentric band the ring c. The opening of the ring f is therefore also eccentric,according to the eccentricity of the eccentric b. The ring f cannot turnupon the shaft a, but is so, connected with the latter that it can alterits position with regard to thecentral axis as shown, for instance, inthe drawings by means of a pin g, which enters a slot in a disk h,rigidly mounted upon the shaft ct. The hollow ratchet-wheel e is heldagainst rotation in one direction by a 'pawl p or the like.

. pled with the driving device, is turned and presses the 'ring c,coupled with the ratchetwheel e by means of the pin d, in frictional'engagement with the ring f, coupled to the .shaft a, and thereforecauses the ring f with ,its outer circumference to bind against theinner circumference of the ratchet-Wheel e, Vand, therefore theeccentric ring f, coupled with the latter, cannot immediately partake.in the motion because of the weight of the load. As soon as thefriction'produced by the cooperation of these parts has become so strongas to overcome the resistance of the load the latter will be raised. Theload will stop at any desired point upon stopping the IOO driving deviceas the pawl engages with the ratchet-wheel e, and the latter preventsthe friction-ring c, coupled with the ratchetwheel by the pin d, frommoving backward, the ring f, coupled with the shaft a, being pressedbetween e and c, and the eccentric b, being of such eccentricity as tobe independent of the action of the load, (it being isolated throughring 0,) is compressed between the ring c and the axial bore of theratchet- Wheel e. The effort of the load maintains the clutch in act-ionuntil the driving device or the eccentric b is moved by another force inthe direction of the sinking load, and therefore the friction-clutchbecomes slightly released. Consequently the load moves with the shaftct, together with the eccentric ringfcoupled to the latter by the diskh, in the opposite direction to the raising of the load. On stopping thedriving device and its action upon the shaft a the eccentric ring fbecomes forcedor wedged between the ring c and the inner circumferenceof the ratchet-wheel e. In this way the load is brought to a standstill,since, on the one hand, the ratchet-wheel e and the ring c, coupled withthe latter, cannot partake in the rotation of the ring j", owing totheir being prevented from doing so by the pawl engaging with the teethof the ratchet-wheel e. 0n the other hand, the eccentric b cannotpartake in the rotation of the ring f, as it is clamped between the ringc and the axial opening of the Wheel e.

What I claim is- 1. In a friction-clutch, the combination, with a shaft,and a driving member secured thereon; of an inner eccentric journaled onthe said shaft, a driving device secured to the said inner eccentric, aring mounted on the said inner eccen tric,an outer eccentric mounted onthe said ring and operatively connected with the said driving member, awheel mounted on the said ou ter eccentric and operatively connectedwith the said ring, and a stop which normally prevents the said wheelfrom revolving in one direction, substantially as set forth.

2. In a friction clutch, the combination, with a shaft, and a drivingmember secured thereon and provided with a slot; of an inner eccentricjournaled on the said shaft, a driving device secured to the said innereccentric, a ring mounted on the said inner eccentric, an outereccentric mounted on the said ring and provided with a lateralprojection which engages with the slot of the said driving member, aratchetwheel mounted on the said outer eccentric and operativelyconnected with the said ring, and a stop-pawl which engages with thesaid ratchet-wheel, substantially as set forth.

3. A friction-clutch particularly adapted for hoisting and like devicescomprising a driven shaft, an eccentric loosely mounted thereon, anannular ring on said eccentric, a second eccentric mounted ou the ringand having a lateral stud engaging a radial slot in a disk fast on theshaft substantially as described.

In Witness whereof I have hereunto set my hand in presence of twowitnesses.

ANTON BOLZANI.

Witnesses:

HENRY HASPEIL, WOLDEMAR HAUPT.

